4. When her visitors are gone, Karen suddenly remembered her lovely plants outside their house. The orchids are watered every 3 days and the roses are watered every 7 days. It happened that last Friday, Sept.17, she watered them together. Do you think on October 6, Wednesday, is the day that the orchids and the roses will be watered together again? Explain your answer. Show your solution to support your answer.


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